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(No-Model.)

T. H. THOMPSON.

RBAMER. No. 306,189. Patented Oct. '7, 1884.

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% NITED STATES PATENT Fries.

THOMAS THOMPSON, OF HARTFORD, CONNECTICUT, ASSIGNOR TO THE SIGOURNEYTOOL COMPANY, OF SAME PLACE.

REAM ER.

SPECIFICATION forming part of Letters Patent No. 306,189, dated October7, 1884.

Application filed October 27, 1883.

To all whom it may concern.-

Be it known that I, THOMAS H. TnoMrsoN, of Hartford, in the county ofHartford and State of Connecticut, have invented certain new and usefulImprovements in Reamers; and I do hereby declare that the following is afull, clear, and exact description thereof, whereby a person skilled inthe art can make and use the same, reference being bad to the IOaccompanying drawings, and to the letters of reference marked thereon.

Like letters in the figures indicate the same parts.

Figure 1 is a side view of my improved I 5 reamer, with part of the endof the reamerstock cut away to show details of construction. Fig. 2 is atop view of same, the stock being turned one-quarter around. Fig. 3 is aview of same in cross-section on plane denoted by line 00 a: of Fig. 1.Fig. 4 is an end view of same, showing head of feed-screw.

My invention relates to the class of reamers bearing adjustable bladesthat are adapted to be moved up to a defined cutting plane as the edgeis worn away, and so greatly extend the life of the reamer-stock, thecutting-blade, when worn out, being replaced by a new one.

My invention has for its object theproduction of an adjustable reamerthat meets all the requirements of its class in a simple and efficientmanner; and it consists, mainly, in the combination and arrangement ofthe removable cutter and the sliding wedge with the reamerstock andattachment and feed devices, as more fully hereinafter described.

In the accompanying drawings, the letter (t denotes the reamer-stock asa whole, made, preferably, of steel to any desired or standard size; b,a transverse mortise or socket in the stock, fitted in which is theremovable cutter 0, usually of toolsteel, and having the short slots 0,through which are passed the bindingscrews (1 (I, used in holding in itssocket the cutter w'hen adjusted for use. In the stock, crossing thebottom of the mortise b, is also a longitudinal mortise, e, that isclosed at the inner end, 0, which extends beyond the end of the mortiseb, and is open at its outer end, the point of the reamer-stock. In thissocket o a wedge, f, formed to a true taper, is adapted to slide, andthe lower edge of the cutter c,

sloped to this same taper or angle with the axis of the stock, is seatedon the wedge, as

(No model.)

seen in Fig. 1, the wedge being backed by a part of the stock, as seenin Fig. 3. By this construction of parts I provide a firm backing forthe cutter against strains in any direction to which it is subjected inuse. That part of the strain that tends to press the cutter in thedirection of the radius of the stock is transmitted through the cutterand the wedge on which it is seated, and then through the shell of thestock back of the wedge to the side opposite the cutter in the holebeing reamed, so that practically'the cutting-edge takes its bearing onthe inner walls of the hole, with no chance of slipping or springingfrom its work. The end of the reamer-stock, has the chamber g. and thehead of the feedscrew it movesreadily in this chamber when the screw isturned in its threaded socket at the bottom of the chamber. As shown inFig. 1, the under side of the head of screw h is in contact with the endof the wedge, and by turning the screw, as by using the slot in itshead, the wedge is moved longitudinally and controls the radial positionof the cutter in its socket in the stock.

To assemble the parts of this tool for use when they have been fitted,the cutter is held loosely in its socket by means of the binding screws,the wedge is inserted in its socket, and the feed-screw turned to placein its chamber, the wedge forcing the cutter radially outward until itscutting-edge is in the proper plane for cutting, as determined by a gageor standard test-tube. The binding-screws are then turned firmly againstthe cutter.

The various parts are made to standard sizes which are interchangeable.

I claim as my invention- 1. In combination, the reamenstock having thesockets, the removable cutter and its binding-screws, the sliding wedge,and the feed-screw, all substantially as described. 9 5

2. In combination, a reamenstock, a, having a laterally-openingtransverse mortise, b, a longitudinal mortise, e, a radially-movingcutter, c, a tapered wedge, f, movable in mortise c, binding-screw (l,and feed-screw 72, all substantially as described.

THOMAS H. THOMPSON.

WVitnesses:

Cnas. L. Bunnnrr, EDWIN F. DIMOCK.

